DE2608564A1 - Automatic levelling pneumatic suspension - has additional gas springs to level lorry against loading ramp - Google Patents

Abstract

The pneumatic suspension of the lorry is fitted with additional pneumatic rams between the pressure control valve and the axle. When the lorry is backed onto a loading ramp the additional rams are modulated to line up the lorry surface with the ramp, while the main suspension elements are lowered. The vehicle then automatically maintains its height while being loaded. The system can be fitted to existing self levelling suspensions so that loading is eased. The additional arms merely alter the level of the load surface without affecting the setting of the valve.

Description

Automatic level regulation

Description a) General My innovation mainly concerns air-sprung trucks and guarantees compliance with a picture once posed Platform height during loading.

When trucks are loaded from the loading ramp, the lowering takes place the vehicle bed is disadvantageously noticeable due to the weight of the payload. With air-sprung A hand-operated lifting valve is then used several times in vehicles for A-axle regulation triggered at the end of the car, whereby the loader has to leave the loading ramp. The previous The process takes place as follows (see Fig. 1): We do the loading the vehicle platform height of the truck from generally 126 cm to the loading ramp height lowered by generally 117 cm by using the manually operated lifting valve (7a ) the air bags (6) between the rear axle (8- see also Fig. 3) and the vehicle frame (lo in Fig. 3) must be vented accordingly. The truck is now loaded and lowered If the vehicle platform moves, the loader must compensate for this difference in height and ventilate the Suftfedelbälge (6) accordingly via the lifting valve (7a) until the height of the loading lamp has been reached again 0 - This process must be carried out during a loading operation repeated several times.

b) Function of my automatic level regulation My innovation readjustment during the loading process is unnecessary by the rigid connection as a linkage (5a in Fig. 1) between the lever of the air suspension valve (4) and the rear axle (8) replaced with an adjustable air cylinder (5b in pictures 2 and 3) and over the manually operated switching valve (7b in Fig. 2) is switched on and off. That The air suspension valve (4) is attached to the vehicle frame (1o in Fig. 3) is now the following (see Fig. 2) When driving, the two air cylinders (5b) via the manually operated 'switching valve (7b), which is installed in the driver's cab is ventilated. In this way the air cylinder (5b) moves to its full length, which is then identical to that of the previous linkage (5a in Fig. 1). Intended to If the truck is loaded from the loading ramp, the two air cylinders will (5b) vented via the manually operated switching valve (7b). These drive together and pull the lever of the two air suspension valves (4) from the previously horizontal one Position down, whereby the air suspension valve (4) is switched so that the both air bags (6) must be vented a little. The vehicle frame (1o in Fig 3) or the vehicle bed then lowers, as a result of the fact that the lever of the air suspension valve (4) through the air cylinder (5b) at the same distance or height according to the Length of the compressed air cylinder (5b), measured from the rear axle (8) is held as a base, the lever of the pneumatic spring valve (4) comes through the Lower the vehicle frame (10 in Fig. 3) back into the horizontal position and thus terminates the venting of the air suspension bellows (6). This makes the vehicle platform adjusted to the same level as the loading ramp.

The truck is now loaded and the vehicle platform is lowered accordingly the load, the lever of the air suspension valve (4) is now automatically in a brought upward position. This ventilates the air bags (6) and lift the vehicle frame (10 in Figure 3) with the vehicle platform.

or the lever of the air suspension valve (4) is restored by this process brought into the horizontal position and the ventilation of the air bellows (6) closed. This process is repeated several times. This is how the level becomes the vehicle platform to the loading ramp is automatically observed.

After the loading process, the band operated switching valve ( 7b) again given compressed air into the air cylinder (5b), causing them to extend and press the lever of the air suspension valve (4) upwards. Through this process becomes Compressed air is fed into the air bags (6), which then pushes the vehicle into the Raise the normal driving position by means of a rigid linkage (5a in Fig. 1 ) the automatic level control for trucks when loading loading ramps from, as described here, do not materialize, because this only applies to a certain Height when driving (generally 126 cm platform height) is set and effective is.

c) State of the art No device is made by the vehicle industry offered, which makes it possible to use the vehicle platform or

Keeping the dock leveler at the same level when loading, mine is too no device of a similar type as that described here is known.

d) Advantages of my invention By the explained and according to Fig. 2 The circuit diagram shown is simplified by eliminating some of the compressed air system Pipes and valves. Loading trucks and the like from one The loading ramp is simplified and is faster and safer. L. e e r e i t e

Claims (1)

Claim device on vehicles for automatic compliance a platform or chassis height that has been set once, characterized in that that in the existing air suspension system between the air suspension valve (4) and the rear axle (6) an air cylinder (5b) is installed.